Average Annual Precipitation for South Dakota
The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in South Dakota.
Each place has a total for the amount of precipitation it usually receives in a year. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.
The annual precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.
You can jump to a separate table for each region of the state: Eastern, Central and Western South Dakota.
Eastern South Dakota
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 98 | Aberdeen | 21.8 | 554 |
| 99 | Brookings | 25.2 | 640 |
| 95 | Huron | 23.3 | 592 |
| 89 | Mitchell | 25.8 | 655 |
| 104 | Sioux Falls | 27.9 | 707 |
| 77 | Vermillion | 28.0 | 711 |
| 96 | Watertown | 22.7 | 577 |
| 81 | Waubay Wildlife Refuge | 22.5 | 572 |
| 88 | Yankton | 28.7 | 728 |
Central South Dakota
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 91 | Academy | 24.0 | 609 |
| 85 | Mobridge | 17.3 | 438 |
| 84 | Pickstown | 24.4 | 619 |
| 90 | Pierre | 20.2 | 513 |
Western South Dakota
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 94 | Custer | 20.7 | 525 |
| 78 | Hot Springs | 18.6 | 473 |
| 80 | Interior | 19.6 | 498 |
| 133 | Lead | 31.8 | 807 |
| 73 | Lemmon | 18.0 | 457 |
| 102 | Mt. Rushmore National Memorial | 24.1 | 613 |
| 103 | Pactola Reservoir Dam | 21.5 | 547 |
| 79 | Porcupine | 19.9 | 505 |
| 96 | Rapid City | 17.4 | 443 |
| 93 | Spearfish | 21.4 | 544 |
| 88 | Wind Cave National Park | 21.2 | 538 |
Reference
NOAA National Centers for Environmental Information (NCEI). Climate Normals.